Battery case, battery pack having same, and vehicle

Abstract

A battery case, and a battery pack and a vehicle having the same, wherein the battery case (100) includes a metal frame (10) in which a plurality of accommodating cavities (101) for accommodating cells (500) are formed, and an insulating coating layer (40) is provided on the inner surface of the accommodating cavity (100), and a thickness D of the insulating coating layer satisfies formula (I), where I is a test current, V is a test voltage, p is a volume resistivity of the insulating coating layer, D is a sprayed thickness of the insulating coating layer, and A is a total sprayed area of ​​the insulating coating layer.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application is filed based on and claims priority to a Chinese patent application having application number 202121466144.8 and filing date June 30, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of batteries, and in particular to a battery case, a battery pack having the same, and a vehicle. [Background technology]

[0003] In related technologies, the cells of many battery packs are all covered with a PET insulating film (heat-resistant polyester film) to insulate them from the aluminum housing or end plates and side plates. The PET film is generally adhered and fixed to the cells by a pressure-sensitive adhesive, or the PET is hot-pressed to the side plates and end plates by a hot-pressing process. However, this technical solution requires that each cell be covered with an insulating film, which makes the operation complicated and prone to wrinkles in the covering film, affecting assembly. Summary of the Invention

[0004] The present application seeks to solve at least one of the technical problems in the prior art, and aims to provide a battery case that is simple in structure, reliably insulated from cells, and does not affect the assembly of the cells.

[0005] The present application further provides a battery pack having the above battery case.

[0006] The present application further provides a vehicle having the above battery pack.

[0007] A battery case according to a first aspect of the present application includes a metal frame in which a plurality of accommodating cavities for accommodating cells are formed, the plurality of accommodating cavities are arranged at intervals, and an insulating coating layer is provided on an inner surface of the accommodating cavity, and a thickness D of the insulating coating layer is

number

[0008] The battery case of the present application has a plurality of storage cavities arranged at intervals, and an insulating coating layer is provided on the inner surface of the storage cavities, thereby improving the insulation effect between the battery case and the cells, reducing the risk of insulation failure, and improving the safety performance of the battery pack.

[0009] In a specific example of the present application, the elongation at break of the insulating coating layer is greater than 100%.

[0010] In a specific example of the present application, the insulating coating layer has a thickness of 0.05 mm to 0.3 mm.

[0011] In a specific example of the present application, the insulating coating layer is a polyurethane coating layer.

[0012] In a specific example of the present application, the metal frame includes a housing and a plurality of partition plates, the housing having at least one open end in a first direction, the plurality of partition plates being provided within the housing, extending along the first direction and spaced apart in a second direction perpendicular to the first direction, and dividing the internal space of the housing into a plurality of the accommodating cavities.

[0013] In a specific example of the present application, the height of each of the receiving cavities is 0.1m to 0.13m.

[0014] In a specific example of the present application, the sprayed area of ​​the insulating coating layer in each of the receiving cavities is 0.1 m 2 ~0.5m 2 It is.

[0015] A battery pack according to a second aspect of the present application includes the battery case according to the first aspect of the present application and a cell provided within the accommodating cavity.

[0016] By providing the battery case of the first embodiment, the battery pack of the present application can improve the insulation effect between the battery case and the cells, reduce the risk of insulation failure, and improve the safety performance of the battery pack, thereby improving the overall performance of the battery pack.

[0017] In a specific example of the present application, the cell is a pouch cell, a plurality of the pouch cells are provided in the accommodating cavity, the plurality of pouch cells are arranged along a first direction and directly connected, and the battery pack further includes an insulating film coated on the outside of the plurality of pouch cells.

[0018] A vehicle according to a third aspect of the present application includes the battery pack according to the second aspect of the present application.

[0019] A vehicle according to a third aspect of the present application is provided with the battery pack according to the second aspect, thereby improving the overall performance of the vehicle.

[0020] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a schematic view of a battery case according to an embodiment of the present application, viewed from one angle. [Diagram 2] 2 is a schematic view of the battery case shown in FIG. 1, seen from a different angle. [Diagram 3] 2 is a schematic view of the battery case shown in FIG. 1 as viewed from still another angle. [Figure 4] 2 is a schematic view of the battery case shown in FIG. 1 as viewed from still another angle. [Diagram 5] FIG. 2 is an exploded view of a battery pack according to an embodiment of the present application. [Figure 6] 1 is a schematic diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to interpret the present application, but should not be understood as limiting the present application.

[0023] Hereinafter, a battery case 100 according to an embodiment of the first aspect of the present application will be described with reference to FIGS.

[0024] 1, a battery case 100 according to an embodiment of the first aspect of the present application includes a metal frame 10 in which a plurality of accommodating cavities 101 for accommodating cells 500 are formed, the plurality of accommodating cavities 101 being spaced apart, and an insulating coating layer 40 being provided on the inner surface of the accommodating cavities 101. That is, a plurality of accommodating cavities 101 spaced apart may be formed in the battery case 100, each of the plurality of accommodating cavities 101 accommodating a cell 500, for example, the accommodating cavity 101 may be a pouch cell, and the insulating coating layer 40 is sprayed or applied to the inner wall surface of each of the accommodating cavities 101.

[0025] In this embodiment, a plurality of accommodating cavities 101 are formed in the battery case 100, and cells 500 (e.g., pouch cells) are provided in each accommodating cavity 101. For example, by providing only one group (one row) of pouch cells (which may include a plurality of pouch cells connected to the pouch cells of each group) in one accommodating cavity 101, the plurality of groups of cells 500 in the battery case 100 can be separated, so that the number of cell groups arranged in each accommodating cavity 101 can be reduced, the cells 500 in each accommodating cavity 101 can be fixed more easily, and the effect of fixing the cells 500 can be improved. Furthermore, since the plurality of groups of cells 500 are separated by different accommodating cavities 101, the heat insulating effect between the plurality of groups of cells 500 is improved. In this way, if a problem occurs in a certain group of cells 500, it does not directly affect the other groups of cells 500, and it is possible to avoid a chain reaction of problems in the other groups of cells 500, thereby improving the safety performance of the battery pack 1000.

[0026] Furthermore, in this embodiment, by providing an insulating coating layer 40 on the inner wall surface of each receiving cavity 101, when the cell 500 is placed in the receiving cavity 101, the insulating coating layer 40 can achieve the effect of electrical isolation between the cell 500 and the metal frame 10 of the battery case 100, thereby ensuring the insulating effect between the battery case 100 and the cell 500. In addition, since the insulating coating layer 40 is directly sprayed or applied to the inner wall surface of the receiving cavity 101, it can be ensured that the insulating coating layer 40 effectively covers the inner surface of the receiving cavity 101, thus increasing the creepage distance between the cell 500 and the metal frame 10 and reducing the risk of insulation failure.

[0027] Furthermore, the thickness D of the insulating coating layer 40 can satisfy the following formula:

number

[0028] The test voltage and test current are those used when an insulation performance test is performed on the battery case 100 of this embodiment.

[0029] In this embodiment, by setting the thickness D of the insulating coating layer 40 so as to satisfy the above relational expression, the insulating coating layer 40 can meet the insulation performance requirements between the battery case 100 and the cell 500, reduce the risk of insulation failure, and improve the safety performance of the battery pack 1000.

[0030] Furthermore, the test voltage V is 3000 volts or more, and the test current I is less than 1 milliampere, i.e., V≧3000v, I<1mA, so that the insulating coating layer 40 can meet the requirements for insulating performance between the battery case 100 and the cell 500.

[0031] The battery case 100 according to the embodiment of the present application is provided with a plurality of storage cavities 101 arranged at intervals, and an insulating coating layer 40 is provided on the inner surface of the storage cavities 101, thereby improving the insulation effect between the battery case 100 and the cells 500 and reducing the risk of insulation failure, as well as isolating the cells 500 in different storage cavities 101 from each other, thereby improving the safety performance of the battery pack 1000. In addition, the cells 500 can be easily installed in the storage cavities.

[0032] In one embodiment of the present application, the insulating coating layer 40 may be a polyurethane coating layer. That is, the insulating coating layer 40 is mainly made of a polyurethane coating layer material, which has a low elastic modulus and plays a role in cushioning and absorbing shock for the cell 500, and can eliminate local stress concentration of the cell 500. In addition, the polyurethane coating layer can effectively cover the inner surface of the receiving cavity 101 of the battery case 100, increase the creepage distance between the pouch cell and the metal frame 10, and reduce the risk of insulation failure.

[0033] Furthermore, in one embodiment of the present application, the breaking elongation of the insulating coating layer 40 may be greater than 100%. For example, the breaking elongation of the insulating coating layer 40 may be 110%, 120%, 130%, 150%, 170%, or 200%, etc. In this way, the breaking elongation of the insulating coating layer 40 is high, and when the cell 500 is fixed in the receiving cavity by adhesion, the insulating coating layer 40 can play a role of buffering and shock absorption for the cell 500, and can eliminate local stress concentration of the cell 500.

[0034] In some embodiments of the present application, the thickness of the insulating coating layer 40 is 0.05 mm to 0.3 mm, that is, the thickness of the insulating coating layer 40 may be in the range of 0.05 mm to 0.3 mm. For example, the thickness of the insulating coating layer 40 may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, etc. In this way, the user can determine the thickness of the insulating coating layer 40 based on the voltage and current of different battery packs 1000 and different cells 500 to meet the insulation requirements of different battery packs 1000 and different cells 500.

[0035] In some embodiments of the present application, as shown in Fig. 1, the metal frame 10 includes a housing 1 and a plurality of partition plates 2, the housing 1 may be formed in a box shape, and at least one end of the housing 1 in a first direction (e.g., the front-rear direction shown in Fig. 1) is open, and the first direction may be the length direction of the housing or the width direction of the housing. For example, the housing 1 is formed in a rectangular box shape, and both ends of the housing 1 in the length direction are open, in other words, the housing 1 has an upper plate, a left plate, a lower plate, and a right plate connected in order to form a rectangular ring, the upper plate and the lower plate are vertically parallel and spaced apart, the left plate and the right plate are parallel and spaced apart, and the upper plate and the left plate are perpendicular to each other.

[0036] Furthermore, the partition plates 2 are provided in the housing 1, and each of the partition plates 2 extends along a first direction (for example, the front-rear direction shown in FIG. 1) and is arranged at intervals in a second direction (for example, the left-right direction shown in FIG. 1) perpendicular to the first direction (for example, the front-rear direction shown in FIG. 1), dividing the internal space of the housing 1 into a plurality of storage cavities 101. In other words, the storage cavities 101 are defined between two adjacent partition plates, and the storage cavities 101 may be defined between two partition plates 2 that are on the outermost sides in the width direction of the housing 1 among the plurality of partition plates 2 and two side plates in the width direction of the housing 1 (for example, the left side plate and the right side plate of the housing 1). In this way, a plurality of storage cavities 101 can be formed in the housing 1, and the plurality of storage cavities 101 are arranged at intervals in the width direction of the housing 1 and extend in the length direction of the housing 1. This simplifies the structure of the battery case 100 and facilitates the assembly of the cells 500 into the corresponding accommodating cavities 101, provided that multiple accommodating cavities 101 are formed spaced apart horizontally.

[0037] When the first direction is the length direction of the housing, the second direction is the width direction of the housing, and when the first direction is the width direction of the housing, the second direction is the length direction of the housing.

[0038] In some examples, the metal frame 10 may be integrally molded, in other words, the metal frame 10 is not a separate, removable structure, thus improving the integrity of the battery case 100 and improving the overall strength of the battery case 100.

[0039] In some examples, the height of each of the accommodating cavities 101 may be 0.1 m to 0.13 m, that is, the height of each of the accommodating cavities 101 may be in the range of 0.1 m to 0.13 m. As shown in FIG. 2, the height of the accommodating cavities 101 in the vertical direction is in the range of 0.1 m to 0.13 m. For example, the height of the accommodating cavities 101 may be 0.11 m, 0.12 m, etc. In this way, the user can set the size of the accommodating cavity 101 based on the number of cells 500 in the cell group, so that the size of a certain number of cells 500 connected in series matches the size of the accommodating cavity 101, and the multiple cells 500 in the cell group fill the accommodating cavity 101.

[0040] In some examples, the spray area of ​​the insulating coating layer 40 in each receiving cavity 101 is 0.1 m 2 ~0.5m 2 That is, the sprayed area of ​​the insulating coating layer 40 in each cavity 101 is 0.1 m 2 ~0.5m 2 For example, the spray area of ​​the insulating coating layer 40 in each of the receiving cavities 101 may be in the range of 0.2 m 2 , 0.3m 2 , 0.4m 2 etc. may be used.

[0041] As shown in FIG. 1, the battery case 100 includes a rectangular parallelepiped housing 1 and a plurality of partition plates 2 provided in the housing 1. Both the front and rear sides of the housing 1 are open. The partition plates 2 extend along the front-rear direction and are arranged at intervals in the left-right direction of the housing 1. The partition plates 2 divide the space in the housing 1 into a plurality of storage cavities 101 arranged at intervals along the left-right direction. Each storage cavity 101 has a bottom wall, a top wall, a left side wall, and a right side wall. The insulating coating layer 40 is sprayed on the bottom wall, the top wall, the left side wall, and the right side wall of the storage cavity 101. The sprayed area of ​​the insulating coating layer 40 in each storage cavity 101 is equal to the total area of ​​the four wall surfaces of the bottom wall, the top wall, the left side wall, and the right side wall of the storage cavity 101. The total area of ​​the inner walls of each storage cavity 101, i.e., the sprayed area of ​​the insulating coating layer 40 in each storage cavity 101, is 0.1 m. 2 ~0.5m 2 It may be in the range.

[0042] This ensures that the insulating coating layer 40 is sprayed onto all of the inner walls of the receiving cavity 101, thereby ensuring the electrical insulation effect between the battery case 100 and the cells 500.

[0043] In some embodiments, the battery case 100 further includes a mounting seat 3, and there are two mounting seats 3, each of which is provided on both sides of the housing 1 in the width direction, and is arranged symmetrically in the width direction of the housing 1. Furthermore, the mounting seats 3 extend outwardly away from the housing 1 along the width direction of the housing 1, and extend in a strip shape along the length direction of the housing 1. The mounting seats 3 are formed with mounting holes 31 penetrating the mounting seats 3 along the height direction of the housing 1 (e.g., the up-down direction shown in FIG. 1), and each mounting seat 3 has a plurality of mounting holes 31, and the multiple mounting holes 31 are arranged at intervals in the length direction of the housing 1 (e.g., the front-rear direction shown in FIG. 1).

[0044] The battery pack 1000 according to the embodiment of the second aspect of the present application includes the battery case 100 according to the embodiment of the first aspect of the present application, and a cell 500 provided in the receiving cavity 101. Preferably, the cell 500 may be an aluminum housing cell, a pouch cell, or a cylindrical cell.

[0045] The remaining configuration and operation of the battery pack 1000 according to the embodiments of the present application are known to those skilled in the art and will not be described in detail herein.

[0046] By providing the battery case 100 of the embodiment of the present application according to the first aspect, the battery case 100 not only improves the insulation effect between the battery case 100 and the cells 500 and reduces the risk of insulation failure, but also isolates the cells 500 in different accommodating cavities 101 from each other, thereby improving the safety performance of the battery pack 1000, thereby improving the overall performance of the battery pack 1000.

[0047] For example, the battery pack 1000 may include a battery case 100 and a pouch cell, and the battery case 100 has a plurality of housing cavities 101, and the pouch cell is formed into a plurality of groups, and each cell 500 group includes a plurality of connected cells 500. The plurality of pouch cell groups may correspond one-to-one with the plurality of housing cavities 101, and each pouch cell group may be provided in a corresponding housing cavity 101, and the number of pouch cell groups may be greater than the number of housing cavities 101, and in this case, one housing cavity 101 may be provided with one or more pouch cell groups, and preferably, the number of pouch cell groups in each housing cavity 101 is set to 2 or less.

[0048] In some embodiments of the present application, the cell 500 is a pouch cell, and a plurality of pouch cells are provided in the storage cavity, and the plurality of pouch cells in the storage cavity are arranged along a first direction (e.g., the front-to-rear direction shown in FIG. 1) and are directly connected, for example, the plurality of pouch cells in the storage cavity may be directly connected in sequence along the length direction of the storage cavity.

[0049] Furthermore, the battery pack 1000 may further include an insulating film 600 coated on the outside of the plurality of pouch cells, that is, the insulating film 600 may be coated on the outside of the plurality of pouch cells, for example, the insulating film 600 may be a PET insulating film 600, and the insulating film 600 may be attached to the plurality of pouch cells by a pressure-sensitive adhesive. By coating the outside of the pouch cells with the insulating film 600, the insulating film 600 not only temporarily fixes the pouch cell group to facilitate the incorporation of the pouch cell group into the accommodating cavity 101 of the battery case 100, but also the insulating film 600 and the insulating coating layer 40 form a two-layer insulating structure between the pouch cell group and the metal frame 10 of the battery case 100, thereby improving the insulating effect between the pouch cell and the metal frame 10 of the battery case 100.

[0050] In some embodiments of the present application, the insulating film 600 coated on the outside of the pouch cell group and the insulating coating layer 40 on the inner surface of the receiving cavity 101 are adhesively connected, for example, an adhesive layer is applied to the outer surface of the insulating film 600 and / or the insulating coating layer 40 on the inner surface of the receiving cavity, and when the pouch cell group is assembled into the receiving cavity, the insulating film 600 and the insulating coating layer 40 are bonded by the adhesive layer. Here, the insulating coating layer 40 is provided on the inner surface of the receiving cavity 101, and the adhesive strength between the insulating coating layer 40 material and the metal frame 10 (e.g., aluminum alloy frame) of the battery case 100 is very high, and the insulating coating layer 40 material has high surface tension and can be well wetted by the adhesive of the adhesive layer to obtain high adhesive strength, which is advantageous for the adhesive connection between the insulating coating layer 40 and the insulating film 600, and can improve the fixing effect of the structure of the cell 500.

[0051] Hereinafter, a battery pack 1000 according to a specific embodiment of the present invention will be described with reference to FIGS.

[0052] As shown in FIGS. 1 to 4, the battery pack 1000 includes a battery case 100 and a plurality of cells 500 provided in the battery case 100.

[0053] Specifically, the battery case 100 includes a metal frame 10 and an insulating coating layer 40. The metal frame 10 is made of an all-aluminum material molded as a single unit. The housing 1 of the metal frame 10 is formed into a hollow rectangular parallelepiped structure. The front and rear sides of the housing 1 are open. A plurality of partition plates 2 are provided inside the housing 1. The partition plates 2 extend along the front-to-rear direction and divide the space within the housing 1 into a plurality of storage cavities 101 spaced apart on the left and right sides. The storage cavities 101 store pouch cells.

[0054] The length of the housing 1 in the front-to-rear direction is in the range of 1.5m to 2m, the width of the housing 1 in the left-to-right direction is in the range of 1m to 1.5m, the height of the housing 1 in the up-to-down direction is in the range of 0.1m to 0.15m, the width of each accommodating cavity 101 in the left-to-right direction is in the range of 0.01m to 0.05m, and the height of each accommodating cavity 101 in the up-to-down direction is in the range of 0.1m to 0.13m.

[0055] An insulating coating layer 40 is sprayed or applied to all four sides of the receiving cavity 101, and the pouch cell and the aluminum housing 1 are insulated by the insulating coating layer 40. The thickness of the insulating coating layer 40 must meet a certain thickness value, and the thickness of the insulating coating layer 40 may be calculated according to the formula I=V*A / (p*D), where V is the test voltage in v, p is the volume resistivity of the insulating layer in Ω*m, D is the sprayed thickness of the insulating layer in m, and A is the total sprayed area of ​​the insulating layer in m. 2 where I is the test current, the unit of which is A. Generally, I<1mA must be satisfied, and V=3000v. The spraying area of ​​the insulating coating layer 40 of a single containing cavity 101 is 0.1m 2 ~0.5m 2 The spray thickness of the insulating coating layer 40 is 0.05 mm to 0.3 mm.

[0056] The cells 500 may be formed into a plurality of cell groups, each of which includes a plurality of cells 500. The cells 500 in each cell group may be arranged in a first direction (for example, the front-rear direction shown in FIG. 1) and connected in series, and one or two cell groups may be provided in one receiving cavity 101. When the cell group is fixed inside the receiving cavity 101 by adhesion, the insulating coating layer 40 may be sprayed on the inner surface of the housing 1, and the adhesion between the coating layer material and the metal frame 10 is very high, and the cell group is adhesively connected to the insulating coating layer 40 on the inner surface of the receiving cavity by the adhesive layer, and the coating layer material has high surface tension and can be well wetted by the adhesive to obtain high adhesive strength, thereby improving the adhesion effect between the pouch cell group and the insulating coating layer 40 and improving the fixing effect of the structure of the pouch cell group.

[0057] In addition, the insulating coating layer 40 is mainly made of polyurethane coating material, which has a low elastic modulus and a breaking elongation of >100%. When the cell group is bonded to the inner surface of the accommodating cavity, the cell group will be subjected to a torsional moment along the length of the cell group in addition to the shear stress and tensile stress in the accommodating cavity. At this time, the moment arm is the length of the cell group, which causes stress concentration and is prone to breakage. The polyurethane coating layer material of this embodiment can play the role of cushioning, shock absorption, and stress concentration relief.

[0058] In the battery pack 1000 according to the embodiment of the present application, an insulating coating layer 40 is sprayed onto the inner surface of the storage cavity 101 of the battery case 100. Such a coating layer material effectively covers the inner surface of the aluminum material molded cavity, increases the creepage distance between the pouch cell and the aluminum material, and reduces the risk of insulation failure.

[0059] A vehicle 10000 according to an embodiment of the third aspect of the present application includes the battery pack 1000 according to the embodiment of the second aspect of the present application.

[0060] The remaining configuration and operation of vehicle 10000 according to embodiments of the present application are known to those skilled in the art and will not be described in detail herein.

[0061] By providing the battery pack 1000 of the embodiment of the present application, the vehicle 10000 can improve the insulation effect between the battery case 100 and the cell 500, reduce the risk of insulation failure, and improve the safety performance of the vehicle 10000.

[0062] In addition, in the description of this application, the orientations or positional relationships indicated by the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," "circumferential direction," and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to easily explain and simplify the description of this application, and do not indicate or suggest that the illustrated devices or parts must have a specific orientation and be configured and operate in a specific orientation, and therefore should not be understood as limiting the application.

[0063] Additionally, the terms "first" and "second" are for descriptive purposes only and should not be understood to denote or suggest a relative importance or to imply a number of the technical features depicted. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, "plurality" means two or more than two, unless otherwise clearly and specifically limited.

[0064] In this application, unless otherwise clearly specified and limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication, a direct connection, an indirect connection via an intermediate medium, a communication between two parts, or an interaction between two parts. A person skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0065] In the description of this specification, a description referring to the terms "one embodiment", "several embodiments", "examples", "specific examples" or "several examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the exemplary expressions of the above terms do not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials or characteristics described can be appropriately combined in any one or more embodiments or examples. In addition, if not mutually inconsistent, a person skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples.

[0066] Although embodiments of the present application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and objectives of the present application, and that the scope of the present application is limited by the claims and their equivalents. [Explanation of symbols]

[0067] 100 Battery case 101 Storage Cavity 10 Metal Frame 1. Housing 2 Partition 3 Mounting base 31 Mounting hole 40 Insulating coating layer 500 cells 600 Insulating Film 1000 Battery Packs 10000 vehicles

Claims

1. The cell assembly includes a metal frame (10) having a plurality of storage cavities (101) for storing cells (500), the plurality of storage cavities (101) being arranged at intervals, and an insulating coating layer (40) being provided on the inner surface of the storage cavity (101); The thickness D of the insulating coating layer (40) satisfies the following formula: [0010] In the formula, V is a test voltage in volts, the test voltage V being 3000 volts or more, I is a test current in amperes, the test current I being less than 1 milliampere, p is a volume resistivity of the insulating coating layer (40) in Ω·m, D is a thickness of the insulating coating layer (40) in m, and A is a total area of ​​the insulating coating layer (40) in m. ２ and The metal frame (10) includes a housing (1) and a plurality of partition plates (2); The housing (1) has at least one end in a first direction open, The plurality of partition plates (2) are provided in the housing (1), extend along the first direction, and are arranged at intervals in a second direction perpendicular to the first direction, to divide the internal space of the housing (1) into a plurality of the accommodating cavities (101); a first side wall and a second side wall each consisting of two partition plates (2) facing each other inside each of the accommodating cavities (101); the insulating coating layer (40) is spray-painted on the bottom wall, the top wall, the first side wall and the second side wall of each of the accommodating cavities (101); and an area of ​​the insulating coating layer (40) in each of the accommodating cavities (101) is equal to the total area of ​​the four wall surfaces of the bottom wall, the top wall, the first side wall and the second side wall of the accommodating cavity (101).

2. 2. The battery case according to claim 1, wherein the insulating coating layer (40) has a breaking elongation of more than 100%.

3. 2. The battery case according to claim 1, wherein the insulating coating layer (40) has a thickness of 0.05 mm to 0.3 mm.

4. 2. The battery case according to claim 1, wherein the insulating coating layer (40) is a polyurethane coating layer.

5. The battery case according to claim 1, characterized in that the height of each of the receiving cavities (101) is 0.1 m to 0.13 m.

6. The area of ​​the insulating coating layer (40) in each of the receiving cavities (101) is 0.1 m ２ ~0.5m ２ 2. The battery case according to claim 1, wherein:

7. A battery case (100) according to any one of claims 1 to 6, a cell (500) disposed within the accommodating cavity (101).

8. The battery pack of claim 7, characterized in that the cell (500) is a pouch cell, a plurality of the pouch cells are provided in the accommodating cavity (101), the plurality of pouch cells are arranged along a first direction and directly connected, and the battery pack (1000) further includes an insulating film (600) coated on the outside of the plurality of pouch cells.

9. A vehicle comprising the battery pack (1000) according to claim 7.

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